Bartosz Chmielowski, MD, PHD
NPI 1801067897ActiveIndividual· Internal Medicine, Hematology & Oncology· Los Angeles, CA
Internal Medicine, Hematology & Oncology (MD, PHD) with The Regents of the University of California, practicing in Los Angeles, California. In 2024 Medicare paid $5,045,326 for 564 patients, and Part D covered 567 of their prescriptions, 67% of them generic. Immunocore Limited was the largest of 4 companies reporting payments in 2025, $7,768 in all, mostly honoraria. Lists Ronald Reagan UCLA Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1801067897 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | Mar 18, 2008 |
| Last updated in NPPES | Feb 9, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A89689 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 564 |
|---|---|
| Services billed | 131,355 across 143 procedure codes |
| Paid by Medicare | $5,045,326 |
Part D prescriptions in 2024
| Prescriptions (claims) | 567 · 776 30-day fills |
|---|---|
| Patients | 95 |
| Total drug cost | $2,355,040 |
| Generic share | 67% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- The Regents of the University of CaliforniaSanta Monica, CA · 1,462 clinicians
Hospital affiliations
- Ronald Reagan UCLA Medical CenterLos Angeles, CA
- Santa Monica - UCLA Med Ctr & Orthopaedic HospitalSanta Monica, CA
- UCLA West Valley Medical CenterWest Hills, CA
Industry payments (Open Payments)
- 2025$7,768 · 13 payments from 4 companies
- 2024$2,473 · 8 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Immunocore Limited | $7,493 | 8 |
| Delcath Systems | $139.09 | 3 |
| Regeneron Pharmaceuticals, Inc. | $115.89 | 1 |
| Array Biopharma Inc | $19.83 | 1 |
What the 2025 payments were for
- Honoraria$7,200 · 2 payments
- Food and Beverage$458.89 · 9 payments
- Travel and Lodging$109.00 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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